Are you referring to ESX host put in Standby Mode by vCenter DPM?
If you have a vCenter connection, then we should track the vCenter events that notify of "DPM-Standby", and therefore we would not alert on the host being down.
However if you have direct-to-ESX-Host connections, then you would get an alert. This is one reason that a single vCenter connection is the preferred method.
Can you confirm how you have set up your VMware servers in Connected Servers in the nworks UI?
Please also confirm your nworks Management Center version, Collector version and MP version.
Vice President, Product Management